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Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea

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dc.contributor.authorKim, Hyoung-il-
dc.contributor.authorKim, Kitae-
dc.contributor.authorPark, Soona-
dc.contributor.authorKim, Wooyul-
dc.contributor.authorKim, Seungdo-
dc.contributor.authorKim, Jungwon-
dc.date.available2021-02-22T06:46:17Z-
dc.date.created2020-08-07-
dc.date.issued2019-01-
dc.identifier.issn1383-5866-
dc.identifier.urihttps://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/3883-
dc.description.abstractTiO2 surface modified with both Pd nanoparticles and fluorides (F-TiO2/Pd) was prepared and applied as a photocatalyst in the degradation of urea. Various surface analysis techniques, including X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy, were used to verify the coexistence of Pd nanoparticles and fluorides on the surface of TiO2 in F-TiO2/Pd. F-TiO2/Pd showed a higher photocatalytic activity than those of bare TiO2 and single-component-modified TiO2 photocatalysts such as fluorinated TiO2 (F-TiO2) and Pd-loaded TiO2 (Pd/TiO2). The higher urea degradation efficiency of F-TiO2/Pd is ascribed to the enhanced production of hydroxyl radicals ((OH)-O-center dot) by the synergistic action of the surface Pd and fluoride. Pd nanoparticles and fluorides facilitate the transfer of valence band holes (h(vb)(+)) and their reaction with water molecules, respectively, synergistically enhancing the production of (OH)-O-center dot. The photocatalytic activity of F-TiO2/Pd for the degradation of urea increased upon increasing the fraction of the fluorinated TiO2 surface, which is higher at higher fluoride concentrations and lower pH. Although Pt/TiO2 showed higher photocatalytic activity for the degradation of urea than those of Pd/TiO2 and Au/TiO2, the strong positive effect of fluoride complexation was only exhibited by Pd/TiO2 (a slight positive effect and a negative effect were observed for Au/TiO2 and Pt/TiO2, respectively). As a result, the degradation of urea proceeded more rapidly in a UV-irradiated suspension of F-TiO2/Pd than when any of other photocatalysts (i.e., bare TiO2, Pd/ TiO2, F-TiO2, Au/TiO2, F-TiO2/Au, Pt/TiO2, and F-TiO2/Pt) were used under the same conditions. The first-order degradation rate constants (k) of urea depending on the type of TiO2 were as follows: 0.097 h(-1) for bare TiO2, 0.158 h(-1) for Pd/TiO2, 0.151 h(-1) for F-TiO2, 0.351 h(-1) for F-TiO2/Pd, 0.173 h(-1) for Au/TiO2, 0.223 h(-1) for F-TiO2/Au, 0.240 h for Pt/TiO2, and 0.165 h(-1) for F-TiO2/Pt, respectively. In addition, F-TiO2/Pd proved to be stable in repeated urea degradation cycles.-
dc.language영어-
dc.language.isoen-
dc.publisherELSEVIER SCIENCE BV-
dc.titleTitanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea-
dc.typeArticle-
dc.contributor.affiliatedAuthorKim, Wooyul-
dc.identifier.doi10.1016/j.seppur.2018.07.058-
dc.identifier.scopusid2-s2.0-85051017015-
dc.identifier.wosid000449133600064-
dc.identifier.bibliographicCitationSEPARATION AND PURIFICATION TECHNOLOGY, v.209, pp.580 - 587-
dc.relation.isPartOfSEPARATION AND PURIFICATION TECHNOLOGY-
dc.citation.titleSEPARATION AND PURIFICATION TECHNOLOGY-
dc.citation.volume209-
dc.citation.startPage580-
dc.citation.endPage587-
dc.type.rimsART-
dc.type.docTypeArticle-
dc.description.journalClass1-
dc.description.isOpenAccessN-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.relation.journalResearchAreaEngineering-
dc.relation.journalWebOfScienceCategoryEngineering, Chemical-
dc.subject.keywordPlusTIO2 PHOTOCATALYSIS-
dc.subject.keywordPlusFLUORINATED TIO2-
dc.subject.keywordPlusCATALYTIC-OXIDATION-
dc.subject.keywordPlusROOM-TEMPERATURE-
dc.subject.keywordPlusWATER-
dc.subject.keywordPlusNANOPARTICLES-
dc.subject.keywordPlusMECHANISM-
dc.subject.keywordPlusURINE-
dc.subject.keywordPlusFORMALDEHYDE-
dc.subject.keywordPlusCHLORINATION-
dc.subject.keywordAuthorPhotocatalysis-
dc.subject.keywordAuthorTitanium dioxide-
dc.subject.keywordAuthorPalladium loading-
dc.subject.keywordAuthorFluoride complexation-
dc.subject.keywordAuthorUrea degradation-
dc.identifier.urlhttps://www.sciencedirect.com/science/article/pii/S138358661831390X?via%3Dihub-
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